CMRT, EMRT and AMRT are Responsible Minerals Initiative (RMI) reporting templates used to collect mineral supply-chain information. The key difference is their scope: CMRT covers tin, tantalum, tungsten and gold (3TG); EMRT covers the minerals included in RMI’s extended-minerals reporting scope; and AMRT is used for additional minerals outside the CMRT and EMRT scopes.

The appropriate template depends on the minerals being assessed, the reporting requirements, and the scope of your responsible-minerals program.

CMRT vs. EMRT vs. AMRT at a Glance

In simple terms:

CMRT → 3TG
EMRT → extended minerals
AMRT → additional minerals

RMI released CMRT 6.6, EMRT 2.11 and AMRT 1.31 on April 17, 2026, so companies should use the current applicable template rather than older versions.

What Is the CMRT?

The Conflict Minerals Reporting Template (CMRT) is RMI's standardized tool for collecting information about tin, tantalum, tungsten and gold (3TG) across the supply chain.

A CMRT can collect information about:

• 3TG use
• Supplier and company information
• Smelters and refiners
• Countries of origin
• Responsible-sourcing policies
• Supply-chain due diligence

Companies use this information to support conflict-minerals due diligence and customer reporting.

For the broader CMRT framework, see the CMRT Reporting Template guide.

If you need to understand the actual completion workflow, see how to complete a CMRT.

What Is the EMRT?

The Extended Minerals Reporting Template (EMRT) expands mineral reporting beyond the 3TG minerals covered by the CMRT.

The current EMRT 2.11 covers:

• Cobalt
• Copper
• Natural graphite
• Lithium
• Mica
• Nickel

EMRT is used to collect standardized supply-chain information about these minerals, including supplier, smelter/refiner and due-diligence information.

EMRT is particularly relevant when a company's responsible-minerals program extends beyond traditional 3TG reporting.

What Is the AMRT?

The Additional Minerals Reporting Template (AMRT) is used for minerals outside the applicable CMRT and EMRT scopes.

The current AMRT 1.31 provides a mechanism for companies to assess additional minerals that may be relevant to their supply-chain risk or customer requirements.

AMRT can be useful when organizations need to assess minerals because of:

• Customer requirements
• Supply-chain risk
• Industry-specific requirements
• Emerging mineral concerns
• Internal responsible-sourcing policies

CMRT vs. EMRT: What's the Difference?

The primary difference is mineral scope.

CMRT covers:

Tin + Tantalum + Tungsten + Gold

EMRT covers the minerals included in RMI's current extended-minerals scope.

Therefore, the two templates are not interchangeable.

When should you use CMRT?

Use CMRT when your reporting requirement concerns 3TG.

When should you use EMRT?

Use EMRT when you need to collect information about minerals covered by the current RMI EMRT.

CMRT vs. AMRT: What's the Difference?

CMRT has a defined 3TG scope.

AMRT is intended for additional minerals outside the CMRT and EMRT scopes.

The choice therefore depends on the mineral you need to assess and the requirements of your responsible-minerals program.

EMRT vs. AMRT: What's the Difference?

EMRT is a standardized reporting template for the minerals included in RMI's extended-minerals scope.

AMRT is designed for additional minerals outside the CMRT and EMRT scopes.

If the mineral you need to assess is already covered by the current EMRT, use the EMRT rather than treating it as an AMRT requirement.

Which Template Should You Use?

Use this simple decision framework:

Are you assessing tin, tantalum, tungsten or gold?

Use CMRT.

Is the mineral included in the current RMI EMRT?

Use EMRT.

Is the mineral outside both CMRT and EMRT?

Consider AMRT.

Always verify the current RMI template before starting supplier outreach because mineral scopes and template versions can change.

For the latest CMRT changes, see CMRT 6.6: What Suppliers Need to Know.

Can CMRT, EMRT and AMRT Be Used Together?

Yes.

A company can use multiple RMI templates when its responsible-minerals program covers different mineral groups.

A simplified workflow is:

3TG → CMRT

Extended minerals → EMRT

Additional minerals → AMRT

The important part is maintaining clear reporting scope and version control when collecting and consolidating supplier responses.

How Do CMRT, EMRT and AMRT Fit Into Supplier Reporting?

Selecting the right template is only the first step.

A typical reporting workflow is:

Define scope → Identify suppliers → Select template → Send request → Collect responses → Validate data → Resolve gaps → Consolidate results

Supplier responses should then be reviewed for completeness and consistency.

For CMRT specifically, this includes checking smelter and refiner information against current reference data. See CMRT smelter and refiner validation for the detailed validation process.

For a broader view of the reporting workflow, see the Conflict Minerals Reporting Process.

For companies managing large supplier populations, CMRT Compliance Software can support supplier engagement, collection, validation and reporting workflows.

Managing Mineral Reporting at Scale

Managing multiple reporting templates creates additional work across supplier outreach, response collection, validation, exception management and evidence retention.

A centralized workflow can help compliance teams manage these activities while maintaining traceability across supplier responses.

For practical guidance on responsible-minerals reporting, use the Conflict Minerals Reporting Guide as a supporting resource.